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- W2071945484 abstract "Two series of hydrated double chlorides have been isolated and characterised. Compounds of the red series, MIUCl4,5H2O (MI= K, Rb, or NH4), have an intense absorption at 18,000 cm–1 in their reflectance spectra and in the spectra of their solutions in methanol and 11M hydrochloric acid. There are also bands at 230 and 196 cm–1 in the spectrum of RbUCl4,5H2O which can be assigned to U–Cl stretching vibrations. These electronic and far i.r. bands are absent from the spectra of the green series, MIUCl4xH2O (MI= Rb or NH4), as these closely resemble the reflectance spectra of the uranium(III) sulphates and double sulphates and the spectrum of the hydrated uranium(III) ion. In water the red series gave the spectrum of the hydrated uranium(III) ion. Thus the red series is believed to contain co-ordinated chloride while the green compounds contain uranium(III) in a more ionic environment. Owing to the presence of a small amount of MICl, the degree of hydration of the green series is uncertain. Corresponding bromides could not be isolated. Like the lanthanide(III) metal ions, uranium(III) forms complexes; [U(phaz)6]Cl3 or (Ph4B)3, and [U(dmaz)4](Ph4B)3, with the oxygen-donor ligands phenazone (phaz,1-phenyl-2,3-dimethyl-5-pyrazolone) and 4-dimethylaminophenazone (dmaz), which were isolated from alcoholic solutions of the red double chlorides and the ligands. These complexes are readily oxidised by air and water, and this reactivity prevents an extensive study of the complexing ability of trivalent uranium; many other oxygen-donor ligands were investigated but oxidation of the uranium(III) occurred even under nitrogen." @default.
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- W2071945484 date "1972-01-01" @default.
- W2071945484 modified "2023-09-30" @default.
- W2071945484 title "The chemistry of the trivalent actinides. Part II. Uranium(III) double chlorides and some complexes with oxygen-donor ligands" @default.
- W2071945484 doi "https://doi.org/10.1039/dt9720001932" @default.
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